摘要
为解决汽缸中分面局部汽密性薄弱问题,提出一种自紧式W形金属密封结构改善汽缸中分面局部汽密性的新方法。阐述自紧式W形密封的结构组成及改善汽缸局部汽密性工作机制。建立W形密封结构工作全过程有限元模型,分析工作全过程中W形密封结构的密封性能及压缩回弹性能,并研究各工作参数对接触压力、接触宽度的影响。结果表明,自紧式W形密封结构压缩-卸载后回弹率达到92.3%,具有优异回弹性能和重复使用性;高温承压后,接触区域最大接触应力及接触宽度均增大,具备良好的自紧特性;材料许可范围内,压缩量、工作压力增大,最大接触应力、接触宽度均增大,密封性能提高;温度升高,密封性能下降。W形密封结构可用于提高汽缸中分面汽密性薄弱区域密封性能。
To solve the issue of weak local steam tightness of casing split,a new method,which improving local steam tightness of casing split with self-tightening W-shaped metal seal structure,is proposed.The structural composition of self-tightening W-shaped seal and the working mechanism of improving local steam tightness of casing are described.Establish the finite element model of the whole working process of W-shaped seal structure,analyze the sealing performance and compression-rebound performance of W-shaped seal structure in the whole working process,and study the influence of various working parameters on contact pressure and contact width.The results show that,the self-tightening W-shaped seal structure,the rebound rate of which reaching 92.3%after compression-unloading,has excellent rebound performance and reusability.After high temperature pressure bearing,the maximum contact stress and contact width in the contact area increase,which shows W-shaped seal structure having good self-tightening characteristics;Within the allowable stress range of the material,the compression amount and working pressure increase,the maximum contact stress and contact width increase,and the sealing performance improves;When the temperature rises,the sealing performance decreases;Conclusion:The W-shaped seal structure can be used to improve the sealing performance of the steam tightness weak area of the casing split.
作者
周文慧
马利江
柏燕
潘虹宇
陈涛文
ZHOU Wen-hui;MA Li-jiang;BAI Yan;PAN Hong-yu;CHEN Tao-wen(Hangzhou Steam Turbine Power Group Co.,Ltd.,Hangzhou 310015,China)
出处
《汽轮机技术》
北大核心
2022年第6期434-438,共5页
Turbine Technology
关键词
自紧式密封
W形密封结构
汽缸汽密性
接触应力
接触宽度
self-tightening seal
W-shaped sealing structure
steam tightness of casing
contact stress
contact width
